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ATR16 Syndrome: Mechanisms Linking Monosomy to Phenotype 2 3 4 Christian Babbs,*1 Jill Brown,1 Sharon W

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ATR16 Syndrome: Mechanisms Linking Monosomy to Phenotype 2 3 4 Christian Babbs,*1 Jill Brown,1 Sharon W bioRxiv preprint doi: https://doi.org/10.1101/768895; this version posted October 7, 2019. The copyright holder for this preprint (which was not certified by peer review) is the author/funder. All rights reserved. No reuse allowed without permission. 1 ATR16 Syndrome: Mechanisms Linking Monosomy to Phenotype 2 3 4 Christian Babbs,*1 Jill Brown,1 Sharon W. Horsley,1 Joanne Slater,1 Evie Maifoshie,1 5 Shiwangini Kumar,2 Paul Ooijevaar,3 Marjolein Kriek,3 Amanda Dixon-McIver,2 6 Cornelis L. Harteveld,3 Joanne Traeger-Synodinos,4 Douglas Higgs1 and Veronica 7 Buckle*1 8 9 10 11 12 1. MRC Molecular Haematology Unit, MRC Weatherall Institute of Molecular 13 Medicine, University of Oxford, Oxford, UK. 14 15 2. IGENZ Ltd, Auckland, New Zealand. 16 17 3. Department of Clinical Genetics, Leiden University Medical Center, Leiden, The 18 Netherlands. 19 20 4. Department of Medical Genetics, National and Kapodistrian University of Athens, 21 Greece. 22 23 24 25 *Authors for correspondence 26 [email protected] 27 [email protected] 28 29 1 bioRxiv preprint doi: https://doi.org/10.1101/768895; this version posted October 7, 2019. The copyright holder for this preprint (which was not certified by peer review) is the author/funder. All rights reserved. No reuse allowed without permission. 1 Abstract 2 3 Background: Sporadic deletions removing 100s-1000s kb of DNA, and 4 variable numbers of poorly characterised genes, are often found in patients 5 with a wide range of developmental abnormalities. In such cases, 6 understanding the contribution of the deletion to an individual’s clinical 7 phenotype is challenging. 8 Methods: Here, as an example of this common phenomenon, we analysed 9 34 patients with simple deletions of ~177 to ~2000 kb affecting one allele of 10 the well characterised, gene dense, distal region of chromosome 16 11 (16p13.3), referred to as ATR-16 syndrome. We characterised precise 12 deletion extent and screened for genetic background effects, telomere 13 position effect and compensatory up regulation of hemizygous genes. 14 Results: We find the risk of developmental and neurological abnormalities 15 arises from much smaller terminal chromosome 16 deletions (~400 kb) than 16 previously reported. Beyond this, the severity of ATR-16 syndrome increases 17 with deletion size, but there is no evidence that critical regions determine the 18 developmental abnormalities associated with this disorder. Surprisingly, we 19 find no evidence of telomere position effect or compensatory upregulation of 20 hemizygous genes, however, genetic background effects substantially modify 21 phenotypic abnormalities. 22 Conclusions: Using ATR-16 as a general model of disorders caused by 23 sporadic copy number variations, we show the degree to which individuals 24 with contiguous gene syndromes are affected is not simply related to the 25 number of genes deleted but also depends on their genetic background. We 26 also show there is no critical region defining the degree of phenotypic 27 abnormalities in ATR-16 syndrome and this has important implications for 28 genetic counselling. 29 2 bioRxiv preprint doi: https://doi.org/10.1101/768895; this version posted October 7, 2019. The copyright holder for this preprint (which was not certified by peer review) is the author/funder. All rights reserved. No reuse allowed without permission. 1 Introduction 2 3 Cytogenetic, molecular genetic, and more recently, next generation sequencing 4 (NGS) approaches have revealed copy number variations (CNVs) in the human 5 genome ranging from 1 to 1000s kb (Iafrate et al., 2004; MacDonald et al., 2014). 6 CNVs are common in normal individuals and have been identified in ~35% of the 7 human genome (Iafrate et al., 2004). When present as hemizygous events, in 8 phenotypically “normal” individuals, these imbalances are considered benign; 9 however, CNVs are also amongst the most common causes of human genetic 10 disease and they have been associated with a wide range of developmental 11 disabilities present in up to 14% of the population (Kaminsky et al., 2011). 12 CNVs have been shown to play an important role in neurodevelopmental 13 disorders including autism spectrum disorder, bipolar disorder, and schizophrenia as 14 well as influencing broader manifestations such as learning disabilities, abnormal 15 physical characteristics and seizures (reviewed in Merikangas et al., 2009). Some 16 CNVs occur recurrently in association with one particular phenotype: for example, 17 deletions within 16p11.2 and/or chromosome 22q are frequently associated with 18 autism, and deletions within 15q13.3 and 1q21.1 are found in schizophrenia. 19 However, the impact of most sporadic CNVs on phenotype is much less clear 20 (Merikangas et al., 2009). Difficulty in interpreting CNVs particularly occurs when 21 they result from complex rearrangements such as those associated with unbalanced 22 translocations, inversions, and imprinting effects. 23 To understand the principles and mechanisms by which CNVs lead to 24 developmental abnormalities we have simplified the issue by studying the 25 relationship between uncomplicated deletions within the region ~0.3 to ~2 Mb in the 26 sub-telomeric region of chromosome 16 and the resulting phenotypes. The 34 27 individuals studied here (comprising 11 new and 23 previously reported cases) 28 represent a cohort of patients with the α-thalassaemia mental retardation contiguous 29 gene syndrome, involving the chromosomal region 16p13.3, termed ATR-16 30 syndrome (MIM 141750) (Wilkie et al., 1990). 31 Individuals studied here have monosomy for various extents of the gene-rich 32 telomeric region at 16p13.3 and all have α-thalassemia resulting from loss of both 33 paralogous α-globin genes. Some patients also have mental retardation (MR), 34 developmental abnormalities and/or speech delay and facial dysmorphism. The most 35 severe cases also manifest abnormalities of the axial skeleton. By precisely defining 36 the endpoints of deletions within 16p13.3 we address whether the associated 37 neurological and developmental defects are simply related to the size of the deletions 3 bioRxiv preprint doi: https://doi.org/10.1101/768895; this version posted October 7, 2019. The copyright holder for this preprint (which was not certified by peer review) is the author/funder. All rights reserved. No reuse allowed without permission. 1 and the number of genes removed, whether there are critical haploinsufficient genes 2 within this region and whether similar sized deletions always lead to the same 3 phenotypes. Our findings suggest that while the loss of an increased number of 4 genes tends to underlie more severe phenotypic abnormalities, the genetic 5 background in which these deletions occur contributes to the occurrence of mental 6 retardation and developmental abnormalities. 7 Finally, this subgroup of ATR-16 patients also allowed us to address two 8 long-standing questions associated with large sub-cytogenetic deletions: those of 9 compensatory gene expression and telomere proximity effect (TPE) in cases of 10 telomere repaired chromosomal breakages. 11 4 bioRxiv preprint doi: https://doi.org/10.1101/768895; this version posted October 7, 2019. The copyright holder for this preprint (which was not certified by peer review) is the author/funder. All rights reserved. No reuse allowed without permission. 1 Methods 2 3 Patients 4 Ethical approval was obtained under the title “Establishing the molecular basis for 5 atypical forms of thalassaemia” (reference number MREC: 03/8/097) with written 6 consent from patients and/or parents. Here we focus on a cohort of patients with 7 pure monosomy within 16p13.3 to clarify the effect of the deletion. Number of familial 8 cases. 9 10 Fluorescence in situ Hybridisation (FISH) 11 FISH studies were carried out on fixed chromosome preparations as previously 12 described (Buckle and Rack, 1993) from seven patients (OY, TY, SH, MY, YA using 13 a series of cosmids covering the terminal 2 Mb of chromosome 16p (Supplementary 14 Table 1). FISH studies were also performed using probes specific for the sub- 15 telomeric regions of each chromosome in order to exclude any cryptic chromosomal 16 rearrangements. Subtelomeric rearrangements were detected as previously 17 described (Knight et al., 1997 and Horsley et al., 2001). 18 . 19 20 Southern Blotting 21 Single copy probes labelled with α32P-dCTP were synthesized and used to hybridize 22 Southern blots of DNA isolated from transformed lymphoblastoid cells. 23 24 PCR Detection of Chromosomal Deletions 25 DNA was extracted from mouse/human hybrid cell lines or transformed 26 lymphoblastoid lines. Based on FISH results with chromosome 16 cosmids, primer 27 pairs were designed located at regular intervals across the breakpoint clone. To 28 refine the 16p breakpoint, PCR amplification was performed using normal and 29 abnormal patient hybrid DNA obtained from mouse erythroleukemia (MEL cells) 30 fused to patient cells and selected to contain a single copy of human chromosome 16 31 generated as previously described (Zeitlin & Weatherall, 1983) as template. A 32 positive PCR indicated the sequence was present; a negative PCR indicated it was 33 deleted. All reactions were carried out in 1.5 mM MgCl2, 200 μM dNTPs, 2U of 34 FastStart Taq DNA polymerase (Roche), 1x FastStart PCR Reaction buffer (Roche) 35 (50mM Tris-HCl, 10 mM KCl, 5 mM (NH4)2SO4, pH 8.3). A list of the primer pairs is 36 shown in Supplementary Table 2. 37 5 bioRxiv preprint doi: https://doi.org/10.1101/768895; this version posted October 7, 2019. The copyright holder for this preprint (which was not certified by peer review) is the author/funder. All rights reserved. No reuse allowed without permission. 1 2 Telomere Anchored PCR Amplification 3 Telomere-anchored PCR was undertaken using a primer containing canonical 4 telomeric repeats in conjunction with a reverse primer specific for the normal 16p 5 sequence (primer sequences provided in Supplementary Table 2).
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